luminosity range mask curve limit effect, plus periphery effect on blur

[dmstraker]

Can't remember if I submitted these (also not found on search here, and beta database unavailable):

As in attached and starting with gradient layer, black to white along x-axis. Add Luminosity Range Mask and adjust nodes as shown.

When curve hits top or bottom edge of adjustment square, the effect is sudden, unexpected and presumably incorrect. 

Also when blur is increase, an edge effect around the periphery of the image is seen, much as would be found using a Gaussian Blur. It looks like a 'Preserve Alpha' checkbox is needed.

[NotMyFault]

Can't reproduce on Mac

Can yo share your document?

 

PS tested again in RGB/16, same result.

Luminosity mask OK.afphoto

[dmstraker]

Looks like it's Windows-specific. Attached is what I saw after loading the Luminosity mask OK.afphoto file to 2.0.3.

Thanks for checking on Mac.

[eftee74]

I have the same issue. See three examples with luminosity range mask in preview mode.

Mask in the first picture is ok, but as soon as the curve touches the uppest x-axis (second picture) pure white becomes suddenly black .

I'm able to partialy workaround it moving the most right node to the left. The curve in the third picture is very close to the second one, but pure white remains as is.

[NathanC]

Hi @dmstraker@eftee74

Many thanks for providing detail, this issue is currently logged with the developers, I've bumped the issue with your reports.

[Affinity Info Bot]

The issue "Luminosity Mask gives incorrect results due to clipping range" (REF: AFP-5840) has now been fixed by the developers.
This fix is included in build 2.1.0.1709 (or later) which is already available as a customer beta and will be included in the next release.
Customer beta builds are announced here and you can participate by following these instructions.

If you still experience this problem once you are using that build version (or later) please make a new thread referencing this one.